18QHTF21-9.844-PD

Overview

The 18QHTF21-9.844-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 9.844 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. This component is designed for timing applications requiring precise frequency control within a small form factor.

Feature Summary

• LVCMOS output logic for digital interface compatibility
• Integrated standby mode for power reduction
• Compact 4-SMD no-lead surface mount package

Applications

• General purpose timing circuits
• Digital signal processing systems
• Communication equipment clock sources

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against your system design before procurement. Confirm that the 1.8V supply voltage aligns with your power rail specifications. Ensure the 4-SMD footprint matches your PCB layout constraints. Cross-reference the part number suffix to confirm the exact frequency tolerance and stability grades required for your application.

Selection Notes

Select this oscillator when a low-profile 2.0x1.6mm footprint is required for 9.844 MHz timing. Consider the 1.8V supply constraint and LVCMOS output drive strength. Evaluate the need for standby functionality if power efficiency is critical. Compare against other Mercury 18QHTF21 variants if different frequencies or voltages are needed.

Part Context

This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series offers various frequencies and voltage options within a standardized 4-SMD package. The 'PD' suffix typically indicates the presence of a power-down pin or feature. These components are commonly used in portable electronics and compact digital devices where space and power consumption are limiting factors.

Replacement Considerations

Direct replacements must match the 9.844 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility and electrical characteristics such as phase noise and jitter. Other Mercury parts in the same series with identical parameters may be interchangeable.